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A013552 Numerator of [x^(2n+1)] of the Taylor series sin(cot(x)-coth(x)). 1
-2, 4, -136, 656, -47672, 3091664, -16788784, 15764283616, -3729134588968, 119174509180016, -1148737050343959536, 149765188779100064, -756009870577278864656, 3746439312393916961802272 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..200

EXAMPLE

-2x/3 +4x^3/81 -136x^5/25515 +656x^7/688905-...

MATHEMATICA

Numerator[Take[CoefficientList[Series[Sin[Cot[x] - Coth[x]], {x, 0, 26}], x], {2, -1, 2}]] (* G. C. Greubel, Nov 13 2016 *)

CROSSREFS

Sequence in context: A018500 A271677 A226070 * A018512 A018517 A018539

Adjacent sequences:  A013549 A013550 A013551 * A013553 A013554 A013555

KEYWORD

sign,frac

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

EXTENSIONS

Name edited by R. J. Mathar, Dec 21 2011

STATUS

approved

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Last modified December 7 13:08 EST 2021. Contains 349581 sequences. (Running on oeis4.)